Interior pipe wrench



Nov. 5, 1929. G. R. LIVERGOOD INTERIOR PIPE WRENCH Filed April 5, 1926Patented Nov. 5, 1929 FUNETED STATES PATENT OFF [EE- GERALD R. mvnneoon,or" HOUSTON, TEXAS INTERIOR PIPE WRENCH Application filed April 5, 1926.Serial No. 99,909.

My invention relates to a pipe engaging circular nut of the samediameter as the means adapted to be inserted into a pipe and flange 7and aligned therewith. Between the connected therewith to form a wrenchby nut 10 and the flange 7 is the gripping ring means of which the pipemay be held non-ro- 11. It is mounted rotatably upon the eccen- 5tatably relative thereto. tric bearing and has an eccentric bearing 55in handling pipe in well drilling, it someopening 12 therein to fit saidbearing. Vixen times becomes necessary to disconnect secin neutralposition, as is shown in Fig. 2, the tions of pipe at the upper end ofthe string of gripping ring is aligned with the axis of. the casingwhile the remainder of the pipe is in pipe and out of engagementtherewith. One in the well. It is difiicultto do this for the reasectorof the periphery of the gripping ring is 60 son that the whole string ofpipe in the well provided with vertical teeth 13 to engage the mayrotate, or, it not, the upper sections may casing. unscrew from thesections lower down at a The ring is held against rotation in thecasjoint where the uncoupling is not desired. ing by means of aplurality ofspaced springs 15 it is an object of my invention. toprovide 1% secured at their lower ends to the ring by 65 a pipe grippingdevice to be inserted down means of screws 15 or other similar means.into a string of easing, or other pipe in a well The springs are bowedoutwardly and the upand act to hold the lower sections stationary perends are slidable along the face of the while the upper section orsections are unhead. It is to be understood that the springs screwedtherefrom for removal. It is debear strongly against the casing andresist any 70 sired that the tool be simple and strong, and tendency ofthe ring to rotate therein. also positive and reliable in itsperformance. iVhen it is desired to grip the casing 1 to Referring tothe drawing herewith, Fig. 1 prevent its rotation, the stem 6 is rotatedin is central longitudinal section through a well either direction,ordinarily in a right-hand or pipe showing my device therein in sideelevaclockwise direction. This gives the eccentric 7 tion, certain partsbeing broken away for hearing head 8 a pianetary movement forcgrcaterclearness. Fig. 2 is a transverse secing the teeth 13 into the casingand gripping tion on the plane 2-2 of Fig. 1. Fig. 3 is a it firmly, andtending, if the rotation of the similar section showing the parts inpipe enwrench is continued, to rotate the casing in a gaging position.Like numerals of reference right-hand directio are employed to designatelike parts in all WVhen the casing 1 is thus held, the upper the views.section 2 may be gripped at the surface by The drawing illustrates mydevice as em any form of casing tongs and rotated in a ployed within acasing 1. The upper joint 2 left--hand or counter-clockwise direction tois connected thereto by a coupling 3 of the unscrew it from the couplingso that it may be 8 usual construction. The wrench is shown as withdrawnto be cut or worked upon and inserted downwardly below the coupling tothen, if desired, again inserted and again engage the pipe below thejoint and hold it screwed into the coupling. against rotation. Thewrench thus formed is positive and 40 The wrench comprises a head 4, theupper certain in its action and serves to make the unend of which isformed with a threaded socket screwing of pipe sections from each other,for connection with a stem 6, which may be an while in the well, an easymatter. Its advanordinary drill stem, extending to the sur tages will beunderstood by those skilled in face. A radial flange 7 is formed on thehead the art.

45 below the socket and below this flange the What I claim as new anddesire to protect head is offset from the central axis to provide byLetters Patent is:

an eccentric bearing member 8. Below the 1. A pipe gripping wrenchadapted to be eccentric bearing the diameter of the head inserteddownwardly within a pipe axially is reduced and formed with a centralthreadthereof, an eccentric bearing member thereed shank 9. Screwed uponthe shank 9 is a on, a gripping ring eccentric relative to said bearingmember, there being peripheral teeth on said ring, additional meanscarried by ,said ring adapted to engage said pipe to hold said ringagainst rotation in said pipe, and

means to rotate said member.

2. A pipe gripping wrench for engaging the interior of a pipe,comprising a stem, a head thereon, an eccentric bearing member on saidhead, a ring on said bearing member, normally concentric with said stem,there being teeth on said ring and additional means to resist rotationof said ring, said additional means including leaf springs carried bythe periphery of said ring.

3. A pipe gripping Wrench for engaging the interior of a pipe,comprising a stem, a head thereon including a radial flange, aneccentri'cally mounted bearing member below said flange, a nut belowsaid bearing member,

and a pipe gripping means free to rotate on said bearing member, andmeans adapted to engage the pipe to prevent rotation of said first meanswhen said stem is rotated.

at. A pipe gripping Wrench for engaging the interior of a pipe,comprising a stem, a

head thereon, an eecentrieally mounted gripping ring thereon, meansnormally engaging the pipe to resist rotation of said ring and teeth onsaid ring. In testimony whereof I hereunto. aflix my signature this 31stday of March, A. D. 1926.

GERALD R. LIVERGOOD.

